Chromosome Research

, Volume 2, Issue 1, pp 65–71 | Cite as

Chromosomal locations of four minor rDNA loci and a marker microsatellite sequence in barley

  • Carsten Pedersen
  • Ib Linde-Laursen


Four minor rDNA loci have been mapped physically to barley (Hordeum vulgare L.) chromosomes 1 (7I), 2 (2I), 4 (4I), and 5 (1I) by a two-stepin situ hybridization procedure including a GAA microsatellite sequence. Reprobing with the microsatellite resulted in a distinct banding pattern, resembling the C-banding pattern, which enabled unequivocal chromosome identification. This study suggests that gene mapping accuracy may be improved by using probes with well-characterized and narrow hybridization sites as cytological markers which are situated close to the gene locus. One of the rDNA loci is located about 54% out on the short arm of chromosome 4 and it has not previously been reported in barley. We have disignated the new locusNor-16. rDNA loci on homoeologous group 4 chromosomes have not yet been reported in otherTriticeae species. The origin of these 4 minor rDNA loci is discussed in relation to their equilocal distribution on the chromosomes.

Key words

C-banding chromosome identification Hordeum vulgare in situ hybridization microsatellite 


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Copyright information

© Rapid Communications of Oxford Ltd 1994

Authors and Affiliations

  • Carsten Pedersen
    • 1
  • Ib Linde-Laursen
    • 1
  1. 1.Plant Biology Section, Environmental Science and Technology DepartmentRisø National LaboratoryRoskildeDenmark

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